1 /* 2 * Native support for the I/O-Warrior USB devices 3 * 4 * Copyright (c) 2003-2005 Code Mercenaries GmbH 5 * written by Christian Lucht <lucht@codemercs.com> 6 * 7 * based on 8 9 * usb-skeleton.c by Greg Kroah-Hartman <greg@kroah.com> 10 * brlvger.c by Stephane Dalton <sdalton@videotron.ca> 11 * and St�hane Doyon <s.doyon@videotron.ca> 12 * 13 * Released under the GPLv2. 14 */ 15 16 #include <linux/module.h> 17 #include <linux/usb.h> 18 #include <linux/slab.h> 19 #include <linux/sched.h> 20 #include <linux/mutex.h> 21 #include <linux/poll.h> 22 #include <linux/usb/iowarrior.h> 23 24 /* Version Information */ 25 #define DRIVER_VERSION "v0.4.0" 26 #define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>" 27 #define DRIVER_DESC "USB IO-Warrior driver (Linux 2.6.x)" 28 29 #define USB_VENDOR_ID_CODEMERCS 1984 30 /* low speed iowarrior */ 31 #define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500 32 #define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501 33 #define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511 34 #define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512 35 /* full speed iowarrior */ 36 #define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503 37 38 /* Get a minor range for your devices from the usb maintainer */ 39 #ifdef CONFIG_USB_DYNAMIC_MINORS 40 #define IOWARRIOR_MINOR_BASE 0 41 #else 42 #define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not official yet 43 #endif 44 45 /* interrupt input queue size */ 46 #define MAX_INTERRUPT_BUFFER 16 47 /* 48 maximum number of urbs that are submitted for writes at the same time, 49 this applies to the IOWarrior56 only! 50 IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls. 51 */ 52 #define MAX_WRITES_IN_FLIGHT 4 53 54 /* Use our own dbg macro */ 55 #undef dbg 56 #define dbg( format, arg... ) do { if( debug ) printk( KERN_DEBUG __FILE__ ": " format "\n" , ## arg ); } while ( 0 ) 57 58 MODULE_AUTHOR(DRIVER_AUTHOR); 59 MODULE_DESCRIPTION(DRIVER_DESC); 60 MODULE_LICENSE("GPL"); 61 62 /* Module parameters */ 63 static DEFINE_MUTEX(iowarrior_mutex); 64 static bool debug = 0; 65 module_param(debug, bool, 0644); 66 MODULE_PARM_DESC(debug, "debug=1 enables debugging messages"); 67 68 static struct usb_driver iowarrior_driver; 69 static DEFINE_MUTEX(iowarrior_open_disc_lock); 70 71 /*--------------*/ 72 /* data */ 73 /*--------------*/ 74 75 /* Structure to hold all of our device specific stuff */ 76 struct iowarrior { 77 struct mutex mutex; /* locks this structure */ 78 struct usb_device *udev; /* save off the usb device pointer */ 79 struct usb_interface *interface; /* the interface for this device */ 80 unsigned char minor; /* the starting minor number for this device */ 81 struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */ 82 struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */ 83 struct urb *int_in_urb; /* the urb for reading data */ 84 unsigned char *int_in_buffer; /* buffer for data to be read */ 85 unsigned char serial_number; /* to detect lost packages */ 86 unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */ 87 wait_queue_head_t read_wait; 88 wait_queue_head_t write_wait; /* wait-queue for writing to the device */ 89 atomic_t write_busy; /* number of write-urbs submitted */ 90 atomic_t read_idx; 91 atomic_t intr_idx; 92 spinlock_t intr_idx_lock; /* protects intr_idx */ 93 atomic_t overflow_flag; /* signals an index 'rollover' */ 94 int present; /* this is 1 as long as the device is connected */ 95 int opened; /* this is 1 if the device is currently open */ 96 char chip_serial[9]; /* the serial number string of the chip connected */ 97 int report_size; /* number of bytes in a report */ 98 u16 product_id; 99 }; 100 101 /*--------------*/ 102 /* globals */ 103 /*--------------*/ 104 105 /* 106 * USB spec identifies 5 second timeouts. 107 */ 108 #define GET_TIMEOUT 5 109 #define USB_REQ_GET_REPORT 0x01 110 //#if 0 111 static int usb_get_report(struct usb_device *dev, 112 struct usb_host_interface *inter, unsigned char type, 113 unsigned char id, void *buf, int size) 114 { 115 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 116 USB_REQ_GET_REPORT, 117 USB_DIR_IN | USB_TYPE_CLASS | 118 USB_RECIP_INTERFACE, (type << 8) + id, 119 inter->desc.bInterfaceNumber, buf, size, 120 GET_TIMEOUT*HZ); 121 } 122 //#endif 123 124 #define USB_REQ_SET_REPORT 0x09 125 126 static int usb_set_report(struct usb_interface *intf, unsigned char type, 127 unsigned char id, void *buf, int size) 128 { 129 return usb_control_msg(interface_to_usbdev(intf), 130 usb_sndctrlpipe(interface_to_usbdev(intf), 0), 131 USB_REQ_SET_REPORT, 132 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 133 (type << 8) + id, 134 intf->cur_altsetting->desc.bInterfaceNumber, buf, 135 size, HZ); 136 } 137 138 /*---------------------*/ 139 /* driver registration */ 140 /*---------------------*/ 141 /* table of devices that work with this driver */ 142 static const struct usb_device_id iowarrior_ids[] = { 143 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)}, 144 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)}, 145 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)}, 146 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)}, 147 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)}, 148 {} /* Terminating entry */ 149 }; 150 MODULE_DEVICE_TABLE(usb, iowarrior_ids); 151 152 /* 153 * USB callback handler for reading data 154 */ 155 static void iowarrior_callback(struct urb *urb) 156 { 157 struct iowarrior *dev = urb->context; 158 int intr_idx; 159 int read_idx; 160 int aux_idx; 161 int offset; 162 int status = urb->status; 163 int retval; 164 165 switch (status) { 166 case 0: 167 /* success */ 168 break; 169 case -ECONNRESET: 170 case -ENOENT: 171 case -ESHUTDOWN: 172 return; 173 default: 174 goto exit; 175 } 176 177 spin_lock(&dev->intr_idx_lock); 178 intr_idx = atomic_read(&dev->intr_idx); 179 /* aux_idx become previous intr_idx */ 180 aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1); 181 read_idx = atomic_read(&dev->read_idx); 182 183 /* queue is not empty and it's interface 0 */ 184 if ((intr_idx != read_idx) 185 && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) { 186 /* + 1 for serial number */ 187 offset = aux_idx * (dev->report_size + 1); 188 if (!memcmp 189 (dev->read_queue + offset, urb->transfer_buffer, 190 dev->report_size)) { 191 /* equal values on interface 0 will be ignored */ 192 spin_unlock(&dev->intr_idx_lock); 193 goto exit; 194 } 195 } 196 197 /* aux_idx become next intr_idx */ 198 aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1); 199 if (read_idx == aux_idx) { 200 /* queue full, dropping oldest input */ 201 read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx; 202 atomic_set(&dev->read_idx, read_idx); 203 atomic_set(&dev->overflow_flag, 1); 204 } 205 206 /* +1 for serial number */ 207 offset = intr_idx * (dev->report_size + 1); 208 memcpy(dev->read_queue + offset, urb->transfer_buffer, 209 dev->report_size); 210 *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++; 211 212 atomic_set(&dev->intr_idx, aux_idx); 213 spin_unlock(&dev->intr_idx_lock); 214 /* tell the blocking read about the new data */ 215 wake_up_interruptible(&dev->read_wait); 216 217 exit: 218 retval = usb_submit_urb(urb, GFP_ATOMIC); 219 if (retval) 220 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n", 221 __func__, retval); 222 223 } 224 225 /* 226 * USB Callback handler for write-ops 227 */ 228 static void iowarrior_write_callback(struct urb *urb) 229 { 230 struct iowarrior *dev; 231 int status = urb->status; 232 233 dev = urb->context; 234 /* sync/async unlink faults aren't errors */ 235 if (status && 236 !(status == -ENOENT || 237 status == -ECONNRESET || status == -ESHUTDOWN)) { 238 dbg("%s - nonzero write bulk status received: %d", 239 __func__, status); 240 } 241 /* free up our allocated buffer */ 242 usb_free_coherent(urb->dev, urb->transfer_buffer_length, 243 urb->transfer_buffer, urb->transfer_dma); 244 /* tell a waiting writer the interrupt-out-pipe is available again */ 245 atomic_dec(&dev->write_busy); 246 wake_up_interruptible(&dev->write_wait); 247 } 248 249 /** 250 * iowarrior_delete 251 */ 252 static inline void iowarrior_delete(struct iowarrior *dev) 253 { 254 dbg("%s - minor %d", __func__, dev->minor); 255 kfree(dev->int_in_buffer); 256 usb_free_urb(dev->int_in_urb); 257 kfree(dev->read_queue); 258 kfree(dev); 259 } 260 261 /*---------------------*/ 262 /* fops implementation */ 263 /*---------------------*/ 264 265 static int read_index(struct iowarrior *dev) 266 { 267 int intr_idx, read_idx; 268 269 read_idx = atomic_read(&dev->read_idx); 270 intr_idx = atomic_read(&dev->intr_idx); 271 272 return (read_idx == intr_idx ? -1 : read_idx); 273 } 274 275 /** 276 * iowarrior_read 277 */ 278 static ssize_t iowarrior_read(struct file *file, char __user *buffer, 279 size_t count, loff_t *ppos) 280 { 281 struct iowarrior *dev; 282 int read_idx; 283 int offset; 284 285 dev = file->private_data; 286 287 /* verify that the device wasn't unplugged */ 288 if (dev == NULL || !dev->present) 289 return -ENODEV; 290 291 dbg("%s - minor %d, count = %zd", __func__, dev->minor, count); 292 293 /* read count must be packet size (+ time stamp) */ 294 if ((count != dev->report_size) 295 && (count != (dev->report_size + 1))) 296 return -EINVAL; 297 298 /* repeat until no buffer overrun in callback handler occur */ 299 do { 300 atomic_set(&dev->overflow_flag, 0); 301 if ((read_idx = read_index(dev)) == -1) { 302 /* queue empty */ 303 if (file->f_flags & O_NONBLOCK) 304 return -EAGAIN; 305 else { 306 //next line will return when there is either new data, or the device is unplugged 307 int r = wait_event_interruptible(dev->read_wait, 308 (!dev->present 309 || (read_idx = 310 read_index 311 (dev)) != 312 -1)); 313 if (r) { 314 //we were interrupted by a signal 315 return -ERESTART; 316 } 317 if (!dev->present) { 318 //The device was unplugged 319 return -ENODEV; 320 } 321 if (read_idx == -1) { 322 // Can this happen ??? 323 return 0; 324 } 325 } 326 } 327 328 offset = read_idx * (dev->report_size + 1); 329 if (copy_to_user(buffer, dev->read_queue + offset, count)) { 330 return -EFAULT; 331 } 332 } while (atomic_read(&dev->overflow_flag)); 333 334 read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx; 335 atomic_set(&dev->read_idx, read_idx); 336 return count; 337 } 338 339 /* 340 * iowarrior_write 341 */ 342 static ssize_t iowarrior_write(struct file *file, 343 const char __user *user_buffer, 344 size_t count, loff_t *ppos) 345 { 346 struct iowarrior *dev; 347 int retval = 0; 348 char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */ 349 struct urb *int_out_urb = NULL; 350 351 dev = file->private_data; 352 353 mutex_lock(&dev->mutex); 354 /* verify that the device wasn't unplugged */ 355 if (!dev->present) { 356 retval = -ENODEV; 357 goto exit; 358 } 359 dbg("%s - minor %d, count = %zd", __func__, dev->minor, count); 360 /* if count is 0 we're already done */ 361 if (count == 0) { 362 retval = 0; 363 goto exit; 364 } 365 /* We only accept full reports */ 366 if (count != dev->report_size) { 367 retval = -EINVAL; 368 goto exit; 369 } 370 switch (dev->product_id) { 371 case USB_DEVICE_ID_CODEMERCS_IOW24: 372 case USB_DEVICE_ID_CODEMERCS_IOWPV1: 373 case USB_DEVICE_ID_CODEMERCS_IOWPV2: 374 case USB_DEVICE_ID_CODEMERCS_IOW40: 375 /* IOW24 and IOW40 use a synchronous call */ 376 buf = kmalloc(count, GFP_KERNEL); 377 if (!buf) { 378 retval = -ENOMEM; 379 goto exit; 380 } 381 if (copy_from_user(buf, user_buffer, count)) { 382 retval = -EFAULT; 383 kfree(buf); 384 goto exit; 385 } 386 retval = usb_set_report(dev->interface, 2, 0, buf, count); 387 kfree(buf); 388 goto exit; 389 break; 390 case USB_DEVICE_ID_CODEMERCS_IOW56: 391 /* The IOW56 uses asynchronous IO and more urbs */ 392 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) { 393 /* Wait until we are below the limit for submitted urbs */ 394 if (file->f_flags & O_NONBLOCK) { 395 retval = -EAGAIN; 396 goto exit; 397 } else { 398 retval = wait_event_interruptible(dev->write_wait, 399 (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT))); 400 if (retval) { 401 /* we were interrupted by a signal */ 402 retval = -ERESTART; 403 goto exit; 404 } 405 if (!dev->present) { 406 /* The device was unplugged */ 407 retval = -ENODEV; 408 goto exit; 409 } 410 if (!dev->opened) { 411 /* We were closed while waiting for an URB */ 412 retval = -ENODEV; 413 goto exit; 414 } 415 } 416 } 417 atomic_inc(&dev->write_busy); 418 int_out_urb = usb_alloc_urb(0, GFP_KERNEL); 419 if (!int_out_urb) { 420 retval = -ENOMEM; 421 dbg("%s Unable to allocate urb ", __func__); 422 goto error_no_urb; 423 } 424 buf = usb_alloc_coherent(dev->udev, dev->report_size, 425 GFP_KERNEL, &int_out_urb->transfer_dma); 426 if (!buf) { 427 retval = -ENOMEM; 428 dbg("%s Unable to allocate buffer ", __func__); 429 goto error_no_buffer; 430 } 431 usb_fill_int_urb(int_out_urb, dev->udev, 432 usb_sndintpipe(dev->udev, 433 dev->int_out_endpoint->bEndpointAddress), 434 buf, dev->report_size, 435 iowarrior_write_callback, dev, 436 dev->int_out_endpoint->bInterval); 437 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 438 if (copy_from_user(buf, user_buffer, count)) { 439 retval = -EFAULT; 440 goto error; 441 } 442 retval = usb_submit_urb(int_out_urb, GFP_KERNEL); 443 if (retval) { 444 dbg("%s submit error %d for urb nr.%d", __func__, 445 retval, atomic_read(&dev->write_busy)); 446 goto error; 447 } 448 /* submit was ok */ 449 retval = count; 450 usb_free_urb(int_out_urb); 451 goto exit; 452 break; 453 default: 454 /* what do we have here ? An unsupported Product-ID ? */ 455 dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n", 456 __func__, dev->product_id); 457 retval = -EFAULT; 458 goto exit; 459 break; 460 } 461 error: 462 usb_free_coherent(dev->udev, dev->report_size, buf, 463 int_out_urb->transfer_dma); 464 error_no_buffer: 465 usb_free_urb(int_out_urb); 466 error_no_urb: 467 atomic_dec(&dev->write_busy); 468 wake_up_interruptible(&dev->write_wait); 469 exit: 470 mutex_unlock(&dev->mutex); 471 return retval; 472 } 473 474 /** 475 * iowarrior_ioctl 476 */ 477 static long iowarrior_ioctl(struct file *file, unsigned int cmd, 478 unsigned long arg) 479 { 480 struct iowarrior *dev = NULL; 481 __u8 *buffer; 482 __u8 __user *user_buffer; 483 int retval; 484 int io_res; /* checks for bytes read/written and copy_to/from_user results */ 485 486 dev = file->private_data; 487 if (dev == NULL) { 488 return -ENODEV; 489 } 490 491 buffer = kzalloc(dev->report_size, GFP_KERNEL); 492 if (!buffer) 493 return -ENOMEM; 494 495 /* lock this object */ 496 mutex_lock(&iowarrior_mutex); 497 mutex_lock(&dev->mutex); 498 499 /* verify that the device wasn't unplugged */ 500 if (!dev->present) { 501 retval = -ENODEV; 502 goto error_out; 503 } 504 505 dbg("%s - minor %d, cmd 0x%.4x, arg %ld", __func__, dev->minor, cmd, 506 arg); 507 508 retval = 0; 509 io_res = 0; 510 switch (cmd) { 511 case IOW_WRITE: 512 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 || 513 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 || 514 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 || 515 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) { 516 user_buffer = (__u8 __user *)arg; 517 io_res = copy_from_user(buffer, user_buffer, 518 dev->report_size); 519 if (io_res) { 520 retval = -EFAULT; 521 } else { 522 io_res = usb_set_report(dev->interface, 2, 0, 523 buffer, 524 dev->report_size); 525 if (io_res < 0) 526 retval = io_res; 527 } 528 } else { 529 retval = -EINVAL; 530 dev_err(&dev->interface->dev, 531 "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n", 532 dev->product_id); 533 } 534 break; 535 case IOW_READ: 536 user_buffer = (__u8 __user *)arg; 537 io_res = usb_get_report(dev->udev, 538 dev->interface->cur_altsetting, 1, 0, 539 buffer, dev->report_size); 540 if (io_res < 0) 541 retval = io_res; 542 else { 543 io_res = copy_to_user(user_buffer, buffer, dev->report_size); 544 if (io_res) 545 retval = -EFAULT; 546 } 547 break; 548 case IOW_GETINFO: 549 { 550 /* Report available information for the device */ 551 struct iowarrior_info info; 552 /* needed for power consumption */ 553 struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc; 554 555 memset(&info, 0, sizeof(info)); 556 /* directly from the descriptor */ 557 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor); 558 info.product = dev->product_id; 559 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice); 560 561 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */ 562 info.speed = le16_to_cpu(dev->udev->speed); 563 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber; 564 info.report_size = dev->report_size; 565 566 /* serial number string has been read earlier 8 chars or empty string */ 567 memcpy(info.serial, dev->chip_serial, 568 sizeof(dev->chip_serial)); 569 if (cfg_descriptor == NULL) { 570 info.power = -1; /* no information available */ 571 } else { 572 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */ 573 info.power = cfg_descriptor->bMaxPower * 2; 574 } 575 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info, 576 sizeof(struct iowarrior_info)); 577 if (io_res) 578 retval = -EFAULT; 579 break; 580 } 581 default: 582 /* return that we did not understand this ioctl call */ 583 retval = -ENOTTY; 584 break; 585 } 586 error_out: 587 /* unlock the device */ 588 mutex_unlock(&dev->mutex); 589 mutex_unlock(&iowarrior_mutex); 590 kfree(buffer); 591 return retval; 592 } 593 594 /** 595 * iowarrior_open 596 */ 597 static int iowarrior_open(struct inode *inode, struct file *file) 598 { 599 struct iowarrior *dev = NULL; 600 struct usb_interface *interface; 601 int subminor; 602 int retval = 0; 603 604 dbg("%s", __func__); 605 606 mutex_lock(&iowarrior_mutex); 607 subminor = iminor(inode); 608 609 interface = usb_find_interface(&iowarrior_driver, subminor); 610 if (!interface) { 611 mutex_unlock(&iowarrior_mutex); 612 printk(KERN_ERR "%s - error, can't find device for minor %d\n", 613 __func__, subminor); 614 return -ENODEV; 615 } 616 617 mutex_lock(&iowarrior_open_disc_lock); 618 dev = usb_get_intfdata(interface); 619 if (!dev) { 620 mutex_unlock(&iowarrior_open_disc_lock); 621 mutex_unlock(&iowarrior_mutex); 622 return -ENODEV; 623 } 624 625 mutex_lock(&dev->mutex); 626 mutex_unlock(&iowarrior_open_disc_lock); 627 628 /* Only one process can open each device, no sharing. */ 629 if (dev->opened) { 630 retval = -EBUSY; 631 goto out; 632 } 633 634 /* setup interrupt handler for receiving values */ 635 if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) { 636 dev_err(&interface->dev, "Error %d while submitting URB\n", retval); 637 retval = -EFAULT; 638 goto out; 639 } 640 /* increment our usage count for the driver */ 641 ++dev->opened; 642 /* save our object in the file's private structure */ 643 file->private_data = dev; 644 retval = 0; 645 646 out: 647 mutex_unlock(&dev->mutex); 648 mutex_unlock(&iowarrior_mutex); 649 return retval; 650 } 651 652 /** 653 * iowarrior_release 654 */ 655 static int iowarrior_release(struct inode *inode, struct file *file) 656 { 657 struct iowarrior *dev; 658 int retval = 0; 659 660 dev = file->private_data; 661 if (dev == NULL) { 662 return -ENODEV; 663 } 664 665 dbg("%s - minor %d", __func__, dev->minor); 666 667 /* lock our device */ 668 mutex_lock(&dev->mutex); 669 670 if (dev->opened <= 0) { 671 retval = -ENODEV; /* close called more than once */ 672 mutex_unlock(&dev->mutex); 673 } else { 674 dev->opened = 0; /* we're closing now */ 675 retval = 0; 676 if (dev->present) { 677 /* 678 The device is still connected so we only shutdown 679 pending read-/write-ops. 680 */ 681 usb_kill_urb(dev->int_in_urb); 682 wake_up_interruptible(&dev->read_wait); 683 wake_up_interruptible(&dev->write_wait); 684 mutex_unlock(&dev->mutex); 685 } else { 686 /* The device was unplugged, cleanup resources */ 687 mutex_unlock(&dev->mutex); 688 iowarrior_delete(dev); 689 } 690 } 691 return retval; 692 } 693 694 static unsigned iowarrior_poll(struct file *file, poll_table * wait) 695 { 696 struct iowarrior *dev = file->private_data; 697 unsigned int mask = 0; 698 699 if (!dev->present) 700 return POLLERR | POLLHUP; 701 702 poll_wait(file, &dev->read_wait, wait); 703 poll_wait(file, &dev->write_wait, wait); 704 705 if (!dev->present) 706 return POLLERR | POLLHUP; 707 708 if (read_index(dev) != -1) 709 mask |= POLLIN | POLLRDNORM; 710 711 if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT) 712 mask |= POLLOUT | POLLWRNORM; 713 return mask; 714 } 715 716 /* 717 * File operations needed when we register this driver. 718 * This assumes that this driver NEEDS file operations, 719 * of course, which means that the driver is expected 720 * to have a node in the /dev directory. If the USB 721 * device were for a network interface then the driver 722 * would use "struct net_driver" instead, and a serial 723 * device would use "struct tty_driver". 724 */ 725 static const struct file_operations iowarrior_fops = { 726 .owner = THIS_MODULE, 727 .write = iowarrior_write, 728 .read = iowarrior_read, 729 .unlocked_ioctl = iowarrior_ioctl, 730 .open = iowarrior_open, 731 .release = iowarrior_release, 732 .poll = iowarrior_poll, 733 .llseek = noop_llseek, 734 }; 735 736 static char *iowarrior_devnode(struct device *dev, umode_t *mode) 737 { 738 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 739 } 740 741 /* 742 * usb class driver info in order to get a minor number from the usb core, 743 * and to have the device registered with devfs and the driver core 744 */ 745 static struct usb_class_driver iowarrior_class = { 746 .name = "iowarrior%d", 747 .devnode = iowarrior_devnode, 748 .fops = &iowarrior_fops, 749 .minor_base = IOWARRIOR_MINOR_BASE, 750 }; 751 752 /*---------------------------------*/ 753 /* probe and disconnect functions */ 754 /*---------------------------------*/ 755 /** 756 * iowarrior_probe 757 * 758 * Called by the usb core when a new device is connected that it thinks 759 * this driver might be interested in. 760 */ 761 static int iowarrior_probe(struct usb_interface *interface, 762 const struct usb_device_id *id) 763 { 764 struct usb_device *udev = interface_to_usbdev(interface); 765 struct iowarrior *dev = NULL; 766 struct usb_host_interface *iface_desc; 767 struct usb_endpoint_descriptor *endpoint; 768 int i; 769 int retval = -ENOMEM; 770 771 /* allocate memory for our device state and initialize it */ 772 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL); 773 if (dev == NULL) { 774 dev_err(&interface->dev, "Out of memory\n"); 775 return retval; 776 } 777 778 mutex_init(&dev->mutex); 779 780 atomic_set(&dev->intr_idx, 0); 781 atomic_set(&dev->read_idx, 0); 782 spin_lock_init(&dev->intr_idx_lock); 783 atomic_set(&dev->overflow_flag, 0); 784 init_waitqueue_head(&dev->read_wait); 785 atomic_set(&dev->write_busy, 0); 786 init_waitqueue_head(&dev->write_wait); 787 788 dev->udev = udev; 789 dev->interface = interface; 790 791 iface_desc = interface->cur_altsetting; 792 dev->product_id = le16_to_cpu(udev->descriptor.idProduct); 793 794 /* set up the endpoint information */ 795 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 796 endpoint = &iface_desc->endpoint[i].desc; 797 798 if (usb_endpoint_is_int_in(endpoint)) 799 dev->int_in_endpoint = endpoint; 800 if (usb_endpoint_is_int_out(endpoint)) 801 /* this one will match for the IOWarrior56 only */ 802 dev->int_out_endpoint = endpoint; 803 } 804 /* we have to check the report_size often, so remember it in the endianness suitable for our machine */ 805 dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint); 806 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) && 807 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56)) 808 /* IOWarrior56 has wMaxPacketSize different from report size */ 809 dev->report_size = 7; 810 811 /* create the urb and buffer for reading */ 812 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL); 813 if (!dev->int_in_urb) { 814 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n"); 815 goto error; 816 } 817 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL); 818 if (!dev->int_in_buffer) { 819 dev_err(&interface->dev, "Couldn't allocate int_in_buffer\n"); 820 goto error; 821 } 822 usb_fill_int_urb(dev->int_in_urb, dev->udev, 823 usb_rcvintpipe(dev->udev, 824 dev->int_in_endpoint->bEndpointAddress), 825 dev->int_in_buffer, dev->report_size, 826 iowarrior_callback, dev, 827 dev->int_in_endpoint->bInterval); 828 /* create an internal buffer for interrupt data from the device */ 829 dev->read_queue = 830 kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER), 831 GFP_KERNEL); 832 if (!dev->read_queue) { 833 dev_err(&interface->dev, "Couldn't allocate read_queue\n"); 834 goto error; 835 } 836 /* Get the serial-number of the chip */ 837 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); 838 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial, 839 sizeof(dev->chip_serial)); 840 if (strlen(dev->chip_serial) != 8) 841 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); 842 843 /* Set the idle timeout to 0, if this is interface 0 */ 844 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) { 845 usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 846 0x0A, 847 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, 848 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 849 } 850 /* allow device read and ioctl */ 851 dev->present = 1; 852 853 /* we can register the device now, as it is ready */ 854 usb_set_intfdata(interface, dev); 855 856 retval = usb_register_dev(interface, &iowarrior_class); 857 if (retval) { 858 /* something prevented us from registering this driver */ 859 dev_err(&interface->dev, "Not able to get a minor for this device.\n"); 860 usb_set_intfdata(interface, NULL); 861 goto error; 862 } 863 864 dev->minor = interface->minor; 865 866 /* let the user know what node this device is now attached to */ 867 dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d " 868 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial, 869 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE); 870 return retval; 871 872 error: 873 iowarrior_delete(dev); 874 return retval; 875 } 876 877 /** 878 * iowarrior_disconnect 879 * 880 * Called by the usb core when the device is removed from the system. 881 */ 882 static void iowarrior_disconnect(struct usb_interface *interface) 883 { 884 struct iowarrior *dev; 885 int minor; 886 887 dev = usb_get_intfdata(interface); 888 mutex_lock(&iowarrior_open_disc_lock); 889 usb_set_intfdata(interface, NULL); 890 891 minor = dev->minor; 892 893 /* give back our minor */ 894 usb_deregister_dev(interface, &iowarrior_class); 895 896 mutex_lock(&dev->mutex); 897 898 /* prevent device read, write and ioctl */ 899 dev->present = 0; 900 901 mutex_unlock(&dev->mutex); 902 mutex_unlock(&iowarrior_open_disc_lock); 903 904 if (dev->opened) { 905 /* There is a process that holds a filedescriptor to the device , 906 so we only shutdown read-/write-ops going on. 907 Deleting the device is postponed until close() was called. 908 */ 909 usb_kill_urb(dev->int_in_urb); 910 wake_up_interruptible(&dev->read_wait); 911 wake_up_interruptible(&dev->write_wait); 912 } else { 913 /* no process is using the device, cleanup now */ 914 iowarrior_delete(dev); 915 } 916 917 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n", 918 minor - IOWARRIOR_MINOR_BASE); 919 } 920 921 /* usb specific object needed to register this driver with the usb subsystem */ 922 static struct usb_driver iowarrior_driver = { 923 .name = "iowarrior", 924 .probe = iowarrior_probe, 925 .disconnect = iowarrior_disconnect, 926 .id_table = iowarrior_ids, 927 }; 928 929 module_usb_driver(iowarrior_driver); 930